Last month, Netflix announced they would be releasing 10 new episodes of their original documentary series Making A Murderer, the first season of which captivated seemingly everyone in the world back in 2015.

Netflix

While the first season focused on the trial and eventual imprisonment of Steven Avery and his nephew Brendan Dassey, Making A Murderer Part 2 will follow their legal team's attempt to exonerate both men of their convictions.

Netflix

Both Avery and Dassey were convicted in 2007 of the murder of photographer Teresa Halbach. Making A Murderer presented the theory that Avery was framed by the police department and that Dassey had been coerced into confessing to the crime.

Now Netflix has released the first trailer for Part 2, which introduces Kathleen Zellner, a lawyer specialising in wrongful convictions who is fighting for Avery's release from prison.

"I have one goal, and that's to overturn the conviction of Steven Avery," Zellner is heard saying in the trailer. "If this case is solid — if he's guilty — I'll fail."

Netflix

The trailer suggests Zellner and her legal team will unearth new evidence that contradicts the prosecution's original argument that landed Avery in prison.

Netflix

"The prosecution's case was that Teresa never left the property, but the last call pings off a cell phone tower miles away from the Avery property," Zellner says. "There's an abundance of evidence. This could flip the whole case."

The trailer also partly focuses on Dassey, who in the years since Making A Murderer's release has argued to have his conviction overturned on the basis that his confession was coerced.

Netflix

In 2016, a judge ordered Dassey's release from prison after declaring that his confession had been improperly obtained. However, a full panel of seven judges reviewed the case in December 2017, and Dassey lost his appeal, meaning he continues to serve his life sentence in prison.

"They wanted this information in the worst way. So Brendan thinks, 'If I tell them what they want to hear, I'm going to go home,'" a member of Dassey's legal team tells the camera.

Netflix

The trailer also includes recordings of phone calls with Avery, who says he "didn't think all these people would care" about his case, and that he wants to get out of prison so he can make his parents happy.

Netflix

"Mom and Dad — I know they want to be a happy family again like we used to be," Avery is heard saying. "I want to see if I can put that back together. Get me a big house, so I can take care of them. I want to make them happy as long as they're here. And that's what I'm scared about."

Making A Murderer Part 2 will premiere on Netflix worldwide on October 19.